Filter system and replaceable filter cartridge

ABSTRACT

A filter system can include a replaceable filter cartridge having a spinner element structured to swirl a mixed flow of compressible fluid and oil, as well as an end cap used to enclose an open interior of a filter media of the filter cartridge. The filter cartridge can be configured to interface with and be supported by a mesh holder. A housing can be attached over the filter cartridge to enclose the system and create a flow path for a mixed flow of compressible fluid and oil. The replaceable filter cartridge can be constructed of materials suitable for disposal in a waste incineration process. The mesh holder can be inserted on a combo-block and secured in place by a compression fitting. A stand pipe can extend into the interior of the filter media and be coupled with a central passage of the mesh holder.

TECHNICAL FIELD

The present invention generally relates to filters used for a mixed flowof compressible fluid and oil, and more particularly, but notexclusively, to compressor systems having a replaceable coalescencefilter cartridge.

BACKGROUND

Providing filter cartridges in filtering systems remains an area ofinterest. Some existing systems have various shortcomings relative tocertain applications. Accordingly, there remains a need for furthercontributions in this area of technology.

SUMMARY

One embodiment of the present invention is a unique filter system withreplaceable filter cartridge. Other embodiments include apparatuses,systems, devices, hardware, methods, and combinations for replaceablefilters. Further embodiments, forms, features, aspects, benefits, andadvantages of the present application shall become apparent from thedescription and figures provided herewith.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 depicts a compressor having devices useful to remove unwantedmaterial from a flow of compressible fluid.

FIG. 2 depicts an embodiment of a filter system.

FIG. 3 depicts an embodiment of a filter system.

FIG. 4 depicts an embodiment of a mesh holder.

FIG. 5a depicts an embodiment of a spinner.

FIG. 5b depicts an embodiment of a spinner.

FIG. 6 depicts an embodiment of an end cap.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

For the purposes of promoting an understanding of the principles of theinvention, reference will now be made to the embodiments illustrated inthe drawings and specific language will be used to describe the same. Itwill nevertheless be understood that no limitation of the scope of theinvention is thereby intended. Any alterations and further modificationsin the described embodiments, and any further applications of theprinciples of the invention as described herein are contemplated aswould normally occur to one skilled in the art to which the inventionrelates.

With reference to FIG. 1, a compressor system 50 is illustrated whichincludes a compressor 52 capable of providing compression to acompressible fluid 54 such as, but not limited to, air. Althoughembodiments described herein will make reference to air or compressedair, it will be appreciated that the compressor system 50 can be used topressurize other types of compressible gases. The compressor 52 can takeany variety of forms including but not limited to contact cooled screwcompressors. Such contact cooled screw compressors can use any type oflubricant such as but not limited to oil.

In some embodiments the compressor system 50 can further include one ormore devices 56, 58 to remove unwanted content from the flow ofcompressed air 60 provided by the compressor 52. In general, thecompressor 52 can be in fluid communication one or more filter(s), airdryer(s), etc such as but not limited to the devices 56 and/or 58depicted in FIG. 1. In one non-limited example, the compressor 52 can becoupled with a primary oil filter 56 and a secondary oil filter 58. Sucha primary oil filter 56 can be of a centrifugal separator type to removeunwanted oil from the mixed flow of compressed air and oil 60, while thesecondary oil filter 56 can be a device that uses a coalescence filterto further remove oil from the flow 62 to produce a cleaner flow 64. Itwill be appreciated that in some forms the coalescence filter 58 mightbe the only filter used in a compressor system 50, but can still becoupled with further devices for removing unwanted material from theflow of compressed air 60.

Turning now to FIGS. 2 and 3, one embodiment of a filter 58 is depictedwhich takes the form of a coalescence filter system. It will beappreciated that although the embodiment depicted in FIG. 2 isillustrated using reference numeral 58, some systems may not include thedevice 56, or may include a device 56 but not of the filtering type. Nolimitation is hereby intended that the filter 58 must be a secondaryfilter in any type of system that includes the features of the filter.Filter system 58 includes a replaceable filter cartridge 66 having afilter media 68 disposed between a spinner 70 and end cap 72. In oneembodiment the replaceable cartridge 66 is inserted around a mesh filtermember 74 which is situated upon a mesh holder 76. A housing 78 can beused to enclose the filter cartridge 66 and form various flow passagesfor the conveyance of a mixed flow of compressed fluid and oil as wellas a filtered flow. The housing 78 can be attached to the base of theunit through a threaded or bayonet type connection, but other connectiontypes are also contemplated. In one form the housing 78 is attachedusing a quarter-turn.

As a mixed flow of compressed air 62 enters the filter system 58 ittravels down a conduit and it turned to flow upward and between the meshholder 76 and the housing 78. As air is routed between the mesh holder76 and the housing 78 is passes through the spinner 70 which imparts acircumferential rotation to the flow 62. Suitable space is providedbetween the filter media 68 and the housing 78 to permit swirlingpassage of the flow 62 and adequate distribution of the flow 62. In someforms, a circular shaped filter media 68 and inner surface of thehousing 78 aid in the swirling motion of air. The mixed flow thentraverses through the filter media 68 of the replacement cartridge 66 aswell as traverses through the mesh filter element 74 before beingreceived within an open interior of the replaceable filter cartridge 66.A standpipe 80 can be provided to extend away from the mesh holder 76and is used to receive the flow of compressed fluid 64 after some or allof oil in the mixed flow 62 has been extracted via the filter media 68and mesh filter element 74. The standpipe 80 can be an integral portionof the mesh holder 76, or can be a separate part that is integrated withthe mesh holder 76. The flow received into the standpipe 80 is thendirected out of the filter system 58 through a passage.

As contemplated herein, the filter cartridge 66 can be made as areplaceable module that can be manipulated/handled as a unitary whole asit is inserted into a filter system 58. It is envisioned that such amodular, stand-alone component can include the filter media 68 and atleast one of the spinner 70 and end cap 72. In some forms thestand-alone cartridge 66 can include additional components beyond thefilter media and either or both of the spinner 70 and end cap 72.

The filter media 68 can take on a variety of forms suitable to coalesceoil from the mixed stream 62 of compressed fluid and oil. In someembodiments the filter media 68 can be made of paper made using anyvariety of fiber material. In one form the filter media 68 can be madeof rolled paper, but other forms are also contemplated such as pleated,etc.

Turning now to FIGS. 5a and 5b , and with continued reference to FIGS.1-3, one embodiment of the spinner 70 is depicted. The illustratedembodiment of the spinner includes an inner ring 82, outer ring 84, andairflow members 86 extending between the inner and outer rings. Theairflow members 86 can take on any variety of forms including vanes,orifices, etc. In the form of vanes the airflow members 86 can extendbetween respective leading and trailing edges in any variety of manners.For example, the airflow members 86 can extend in a straight linebetween its leading and trailing edges. In some forms a camber linebetween the leading and trailing edges can be curved. In certain formsthe camber line can be continuous or non-continuous. In still otherforms the airflow members 86 can extend in a segmented manner betweenleading and trailing edges. In short, any variety of shapes arecontemplated for the airflow members 86 of the spinner.

The airflow members 86 can furthermore impart any degree ofcircumferential motion of fluid flowing therethrough. In some forms theairflow members 86 can impart a relatively higher degree ofcircumferential motion than axial motion of the fluid, while in otherforms the airflow members 86 can impart a relatively higher degree ofaxial motion than circumferential motion. In still other forms thecircumferential and axial components of fluid velocity can be the same.As will be understood, whether or not the airflow members 86 take theform of vanes, orifices, etc., one or more airflow passages 88 will beformed in the spinner to traverse from an upstream side of the spinnerto a downstream side, As such, the shape of the passages (which can beformed by neighboring vanes, for example) can dictate the degree ofcircumferential motion relative to the degree of axial motion of the airexiting the downstream side of the spinner 70.

Although the spinner 70 in the illustrated embodiment includes bothinner ring 82 and outer ring 86, in other forms the spinner 70 caninclude fewer components. For example, the spinner 70 can have the outerring 84 and airflow members 86, but lack the inner ring 82. In such aform the airflow members 86 can be individually affixed to the filtermedia. In other forms the spinner 70 can have the inner ring 82 andairflow members 86 but otherwise lack an outer ring 84.

The spinner 70 can be attached to the filter media 68 via any suitablemanner, whether mechanical, bonding, or otherwise. In some forms thespinner 70 can be attached using chemical bonding such as through anadhesive process such as gluing or epoxying. Epoxy can include can beany of a basic component or cured end products of epoxy resins, as wellas represent the epoxide functional group. Any suitable type of adhesiveis contemplated.

Turning now to FIG. 6, and with continued reference to FIGS. 1-3, oneembodiment of the end cap 72 is depicted. The end cap 72 can be used toenclose the open interior of the filter media 68. The end cap caninclude an annular slot defined between an inside wall 88 and outsidewall 90 which can be used to receive the filter media 68 and in someembodiments also receive the mesh filter element 74. Either or both ofthe inside wall 88 and outside wall 90 can extend uninterrupted aroundthe periphery of the filter media 68, but in some forms either or bothof the inside wall 88 and outside wall 90 can include a brokenconfiguration. The size of the annular slot between the inside wall 88and outside wall 90 can receive both of the filter media 68 and meshfilter element 74. In some forms the inside wall 88 can include achamfer or sloped edge to pilot the mesh filter element 74 when thefilter cartridge 66 is inserted onto the mesh filter element 74.

As illustrated in FIG. 3, the housing 78 can include a protuberance 92which can be used to urge the filter cartridge 66 into a seated positionupon the mesh holder 76. In alternative and/or additional embodiments,the protuberance 92 can be located on the end cap 72 as depicted in FIG.6. The protuberance 92 can take on any suitable form and is generallylocated within the outer periphery of the end cap 72. Wherever it islocated, the protuberance 92 can one or more raised surfaces which aretypically blunted in shape as shown.

The end cap 72 70 can be attached to the filter media 68 via anysuitable manner, whether mechanical, bonding, or otherwise. In someforms the end cap 72 can be attached using chemical bonding such asthrough an adhesive process such as gluing or epoxying. Epoxy caninclude can be any of a basic component or cured end products of epoxyresins, as well as represent the epoxide functional group. Any suitabletype of adhesive is contemplated.

The material type of each of the filter media 68, spinner 70, and endcap 72, can all be different, but in some forms one or more of thematerials used for the filter media, spinner, and end cap can be thesame. Reference will be made immediately below to the type of materialthe filter media 68 is made of and its capability of being disposed ofthrough burning (e.g. through an incineration process such as wastetreatment incineration). The discussion below related to theincineration of the filter media material is also applicable to thematerial used in the construction of the spinner and end cap. In someembodiments the material type of the spinner 70 and/or end cap 72 aredifferent from the filter media material, but it will nevertheless beunderstood that the description below of waste disposal of the filtermedia also applies to the spinner 70 and end cap 72 as well. The filtermedia 68 can be made of a filter media material that can be burned, suchas through combustion, in a process that can be characterized by a hightemperature exothermic redox chemical reaction between a fuel and anoxidant. Thermal oxidation of the filter media material can include acombustion process such as deflagration or any other high-temperatureexothermic reaction between a fuel and oxidant. The filter media 68 canact as the fuel to be thermally oxidized with an oxidant such as but notlimited to air. It is contemplated that in some embodiments the filtermedia material can be consumed via thermal oxidation and provide agreater thermal energy output as a result of the thermal oxidation thanthe amount of energy input to provide the elevated temperatures neededfor the thermal oxidation to occur.

It is contemplated that any or all of the filter media material, spinnermaterial, and end cap material are made of a material that can bedisposed of via incineration in a waste treatment process. In someembodiments of the material types incineration can convert thecomponents (filter media, spinner, and/or end cap) into ash, flue gas,and heat. The material type can provide energy recovery during theincineration process. It is contemplated that the material type used insome embodiments of any of the components to be incinerated meets withapplicable regulations of material type suitable for incineration,whether those regulations are promulgated by the United StatesEnvironmental Protection Agency, among any potential others. Varioustypes of incineration processes are contemplated, including burn piles,burn barrels, moving grates, fixed grate, rotary kiln, fluidized bed,and specialized incineration.

In one form the spinner material is contemplated to be made of plastic,such as but not limited to organic polymers that can be of athermoplastic or thermosetting type polymer. It is contemplated that thewide range of plastic materials suitable for use as the spinner materialcan be thermally oxidized in an incineration process as mentioned aboveanywhere in a temperature range of between about 200 C (390 F) to about600 C (1100 F), but other ranges may be useful for other plastic-likematerials.

In one form the end cap material is contemplated to be made of rubber orother suitable type of elastomer, such as but not limited to thosematerials that include polyisoprenes or organic compound isoprenes. Itis contemplated that the wide range of rubber materials suitable for useas the end cap material can be thermally oxidized in an incinerationprocess as mentioned above anywhere in a temperature range of betweenabout 250 C (480 F) to about 350 C (662 F), but other ranges may beuseful for other rubber-like materials.

The mesh filter element 74 can take on a variety of forms and be madefrom a variety of materials. In one embodiment the mesh filter element74 can be a wire mesh construction made of any suitable metallic wirefiber. The mesh construction can be woven or non-woven, depending on theapplication. Such non-woven construction can be made from short and longfibers which can be bonded together using chemical, mechanical, heat, orsolvent treatments. The non-woven embodiments can be flat or tuftedporous sheets.

Turning now to FIG. 4, and with continued reference to FIGS. 1-3, oneform of a mesh holder 76 is depicted. The mesh holder 76 can include awide end 94 and a narrow end 96 disposed opposite the wide end 94 whichgenerally takes a frusto-conical shape similar to a truncated cone. Themesh holder 76 is coupled with a combo-block 98 which includes a drainline 100 which carries oil away from the mesh holder 76. The combo-block98 can be any suitable device that provides a seat for the mesh holder76 and that receives collected oil from the mesh holder 76. The meshholder 76 can be coupled to the combo-block 100 via a compression fitvia one or more seals such as but not limited to o-rings 102. Furtherdetails of the coupling of the mesh holder 76 and combo-block 100 aredescribed further below.

The mesh holder 76 includes an annular groove 104 defined between aninner wall 106 and outer wall 108. The annular groove 104 is structuredto receive the mesh filter element 74. The outer wall 102 can be sizedlarger than the inner wall 100 such that oil that collects in theannular groove 104 is discouraged from radially escaping the mesh holder76 and draining down the side. The mesh holder 76 also includes one ormore drain lines 110 in fluid communication with the annular groove 104to carry away oil that has been collected as a result of the filtering.

Oil collected in the annular groove 104 can flow through drain line 110to a gallery 112 located between the stand pipe 80 and the mesh holder76. The gallery 112 can be any shape and size and in one form is annularin shape. The gallery 112 is in fluid communication with the drain line100 of the combo-block 98. Various seals 114 and 116 can also be used todiscourage oil from escaping beyond the drain line 100. Seals 114 and116 can be o-rings, but other types of seals are also contemplated.

The filter cartridge 66 can interface with the mesh holder 76 via thespinner 70, although other engagement interfaces are also contemplated.As shown in FIG. 4, the spinner can include a stepped feature to fitupon the outer edge of the mesh holder 76 near the outside wall 90. Theoutside wall 90 includes a complementary stepped feature to receive thespinner 70.

Although the mesh holder 76, stand-pipe 80, and combo-block 98 aredepicted as separate elements that together help support and drain oilaway from the filter cartridge 66, in some embodiments two or more ofthese components and be made integral with each other.

One aspect of the present application includes an apparatus comprising areplaceable filter cartridge having a filter media that extends in anaxial direction from a first end to a second end, the replaceable filtercartridge having an annular-shaped airflow spinner affixed to an outersurface of the filter media such that the replaceable filter cartridgeis modular and can be handled as a unitary whole as it is inserted intoa filter housing, the annular-shaped airflow spinner including aplurality of passages defined by a plurality of swirl inducing airflowmembers, the airflow members structured to impart a circumferentialcomponent of swirl to a passing flow of fluid when the replaceablefilter cartridge is installed in a filter cartridge housing.

A feature of the present application includes wherein the annular-shapedairflow spinner is bonded to the filter media.

Another feature of the present application includes wherein theplurality of airflow members are airflow vanes each having a leadingedge and a trailing edge, each of the plurality of passages defined by atop surface of one of the airflow vanes and a bottom surface of anadjacent one of the airflow vanes.

Yet another feature of the present application includes wherein thefilter media is made from a filter media material having a compositionthat will thermally oxidize under elevated temperatures, and wherein theannular-shaped airflow spinner is made from a spinner material having acomposition that will thermally oxidize under elevated temperatures.

Still another feature of the present application includes wherein thespinner material thermally oxidizes at a temperature below about 600 C(1100 F).

Yet still another feature of the present application includes whereinthe annular-shaped airflow spinner forms an abutment surface structuredto seat against a filter canister housing, and wherein theannular-shaped airflow spinner is chemically bonded to the filter media.

Still yet another feature of the present application includes wherein anend cap is affixed to the filter media at a second end to seal an openinterior of the filter media, the end cap including a recess to receivethe filter media, the recess large enough to accommodate a complementarymesh filter when inserted into the open interior of the filter media.

A further feature of the present application includes wherein the endcap is bonded to the filter media at the second end, and wherein the endcap includes an exterior protrusion extending from a top surface of thecap in a direction away from the open interior, the exterior protrusionconstructed to engage a filter housing.

Another aspect of the present application includes an apparatuscomprising: a filter cartridge having a filter media that extends alongan axial direction and having a circular cross section, the filter mediastructured to remove lubricant entrained in a flow of compressed gas,the filter cartridge further including an end cap connected at a firstaxial end of the filter media to enclose an open interior of the filtermedia, the end cap having an arcing groove formed on an inside surfacelocated interior of the filter media, the arcing groove defined betweenan inner groove wall and an outer groove wall, a distance between theinner and outer groove walls sized to fit the filter media, the end capdefined by a peripheral boundary and having a blunted protrusionextending from an interior of the peripheral boundary, the bluntedprotrusion structured to contact an inner surface of a filter housing toprovide a positive pressure to the filter cartridge.

A feature of the present application includes wherein the end capincludes a single blunted protrusion located radially inward from anouter periphery of the end cap.

Another feature of the present application includes the bluntedprotrusion taking the form of a nub having a rounded contact point, andwherein the blunted protrusion extends from the center of the end cap.

Still another feature of the present application includes wherein theend cap is chemically bonded to the filter media, and wherein the endcap is made from an end cap material having a composition that willexothermically oxidize under elevated temperatures.

Yet another feature of the present application includes wherein thearcing groove is an annular shaped groove, and wherein the end cap ischemically bonded to the filter media.

Still yet another feature of the present application includes whereinthe distance between the inner and outer groove walls is sized toaccommodate a secondary filter media in addition to the filter mediachemically bonded to the end cap.

Yet still another feature of the present application includes wherein aspinner is affixed to a second axial end of the filter media oppositethe first axial end, wherein the spinner is affixed via chemicalbonding, and wherein the filter cartridge with end cap and spinner areconstructed as a modular device capable of being handled as a unitarywhole as the filter cartridge is inserted into a filter housing.

A further feature of the present application includes wherein the filtermedia is made of a material that combusts under elevated temperatures,wherein the end cap is made of a material that combusts under elevatedtemperatures, and wherein the spinner is made of a material thatcombusts under elevated temperatures.

A still further feature of the present application includes wherein thespinner includes a plurality of passages structured to impart acircumferential rotation to a flow of fluids passing through thespinner, and wherein the plurality of passages is defined by a pluralityof spinner vanes.

Yet another aspect of the present application includes an apparatuscomprising an oil filter assembly structured to remove oil from a mixedflow of compressed air and oil, the oil filter assembly having: acombo-block base which includes a combo-block oil passage for thereceipt of oil removed from the mixed flow by action of the oil filterassembly, a frusto-conical shaped mesh holder having an open interiorextending between a first base of the frusto-conical shape and anopposing second base of the frusto-conical shape, the mesh holderfurther including an annular well defined in the first end which isstructured to receive a wire mesh filter component, the mesh holderfurther including at least one oil passage that extends from the annularwell to the open interior, and a stand-pipe extending from the openinterior and away from the first end.

A feature of the present application includes wherein the stand-pipe isinserted as a separate component into the open interior of the meshholder, wherein the mesh holder is coupled to the combo-block base viaan o-ring compression fitting, and wherein an annular space is formedbetween an outside of the stand-pipe and an interior wall of the meshholder that defines the open interior, the annular space incommunication with the at least one oil passage.

Another feature of the present application includes wherein the meshholder further includes an outer wall defining the annular well, theouter wall extending away from the first end to form a dam structured todiscourage oil from flowing radially outward away from the mesh holder,and wherein the oil filter assembly further includes a removable housinghaving an interior surface structured to abut a replaceable oil filterelement seated against the mesh holder.

An aspect of the present application includes a method comprising:providing a filter media having a material composition structured toprovide exothermic oxidation at an elevated filter media combustiontemperature, affixing an annular spinner to a first end of the filtermedia, the annular filter structured to provide a circumferentialcomponent of fluid velocity traversing from one side of the annularspinner to an opposing side of the annular spinner, the annular spinnerhaving a material composition structured to provide exothermic oxidationat an elevated spinner combustion temperature, and chemically bonding anend cap to a second end of the filter media, the end cap having amaterial composition structured to provide exothermic oxidation at anend cap combustion temperature.

A feature of the present application includes wherein the affixingincludes applying a chemical bonding agent between the filter media andthe annular spinner.

Another feature of the present application includes wherein thechemically bonding includes positioning an annular groove of the end capover an annular end section of the filter media, wherein the filtermedia material composition is paper, and wherein the paper is rolled.

While the invention has been illustrated and described in detail in thedrawings and foregoing description, the same is to be considered asillustrative and not restrictive in character, it being understood thatonly the preferred embodiments have been shown and described and thatall changes and modifications that come within the spirit of theinventions are desired to be protected. It should be understood thatwhile the use of words such as preferable, preferably, preferred or morepreferred utilized in the description above indicate that the feature sodescribed may be more desirable, it nonetheless may not be necessary andembodiments lacking the same may be contemplated as within the scope ofthe invention, the scope being defined by the claims that follow. Inreading the claims, it is intended that when words such as “a,” “an,”“at least one,” or “at least one portion” are used there is no intentionto limit the claim to only one item unless specifically stated to thecontrary in the claim. When the language “at least a portion” and/or “aportion” is used the item can include a portion and/or the entire itemunless specifically stated to the contrary. Unless specified or limitedotherwise, the terms “mounted,” “connected,” “supported,” and “coupled”and variations thereof are used broadly and encompass both direct andindirect mountings, connections, supports, and couplings. Further,“connected” and “coupled” are not restricted to physical or mechanicalconnections or couplings.

What is claimed is:
 1. An apparatus comprising: a replaceable filtercartridge having a filter media that extends in an axial direction froma first end to a second end, the replaceable filter cartridge having anannular-shaped airflow spinner affixed to an outer surface of the filtermedia such that the replaceable filter cartridge is modular and can behandled as a unitary whole as it is inserted into a filter housing, theannular-shaped airflow spinner including a plurality of passages definedby a plurality of swirl inducing airflow members, the airflow membersstructured to impart a circumferential component of swirl to a passingflow of fluid when the replaceable filter cartridge is installed in afilter cartridge housing.
 2. The apparatus of claim 1, wherein theannular-shaped airflow spinner is bonded to the filter media.
 3. Theapparatus of claim 2, wherein the plurality of airflow members areairflow vanes each having a leading edge and a trailing edge, each ofthe plurality of passages defined by a top surface of one of the airflowvanes and a bottom surface of an adjacent one of the airflow vanes. 4.The apparatus of claim 2, wherein the filter media is made from a filtermedia material having a composition that will thermally oxidize underelevated temperatures, and wherein the annular-shaped airflow spinner ismade from a spinner material having a composition that will thermallyoxidize under elevated temperatures.
 5. The apparatus of claim 4,wherein the spinner material thermally oxidizes at a temperature belowabout 600 C (1100 F).
 6. The apparatus of claim 2, wherein theannular-shaped airflow spinner forms an abutment surface structured toseat against a filter canister housing, and wherein the annular-shapedairflow spinner is chemically bonded to the filter media.
 7. Theapparatus of claim 2, wherein an end cap is affixed to the filter mediaat a second end to seal an open interior of the filter media, the endcap including a recess to receive the filter media, the recess largeenough to accommodate a complementary mesh filter when inserted into theopen interior of the filter media.
 8. The apparatus of claim 7, whereinthe end cap is bonded to the filter media at the second end, and whereinthe end cap includes an exterior protrusion extending from a top surfaceof the cap in a direction away from the open interior, the exteriorprotrusion constructed to engage a filter housing.
 9. An apparatuscomprising: a filter cartridge having a filter media that extends alongan axial direction and having a circular cross section, the filter mediastructured to remove lubricant entrained in a flow of compressed gas,the filter cartridge further including an end cap connected at a firstaxial end of the filter media to enclose an open interior of the filtermedia, the end cap having an arcing groove formed on an inside surfacelocated interior of the filter media, the arcing groove defined betweenan inner groove wall and an outer groove wall, a distance between theinner and outer groove walls sized to fit the filter media, the end capdefined by a peripheral boundary and having a blunted protrusionextending from an interior of the peripheral boundary, the bluntedprotrusion structured to contact an inner surface of a filter housing toprovide a positive pressure to the filter cartridge.
 10. The apparatusof claim 9, wherein the end cap includes a single blunted protrusionlocated radially inward from an outer periphery of the end cap.
 11. Theapparatus of claim 9, the blunted protrusion taking the form of a nubhaving a rounded contact point, and wherein the blunted protrusionextends from the center of the end cap.
 12. The apparatus of claim 11,wherein the end cap is chemically bonded to the filter media, andwherein the end cap is made from an end cap material having acomposition that will exothermically oxidize under elevatedtemperatures.
 13. The apparatus of claim 9, wherein the arcing groove isan annular shaped groove, and wherein the end cap is chemically bondedto the filter media.
 14. The apparatus of claim 13, wherein the distancebetween the inner and outer groove walls is sized to accommodate asecondary filter media in addition to the filter media chemically bondedto the end cap.
 15. The apparatus of claim 14, wherein a spinner isaffixed to a second axial end of the filter media opposite the firstaxial end, wherein the spinner is affixed via chemical bonding, andwherein the filter cartridge with end cap and spinner are constructed asa modular device capable of being handled as a unitary whole as thefilter cartridge is inserted into a filter housing.
 16. The apparatus ofclaim 15, wherein the filter media is made of a material that combustsunder elevated temperatures, wherein the end cap is made of a materialthat combusts under elevated temperatures, and wherein the spinner ismade of a material that combusts under elevated temperatures.
 17. Theapparatus of claim 16, wherein the spinner includes a plurality ofpassages structured to impart a circumferential rotation to a flow offluids passing through the spinner, and wherein the plurality ofpassages is defined by a plurality of spinner vanes.
 18. An apparatuscomprising: an oil filter assembly structured to remove oil from a mixedflow of compressed air and oil, the oil filter assembly having: acombo-block base which includes a combo-block oil passage for thereceipt of oil removed from the mixed flow by action of the oil filterassembly; a frusto-conical shaped mesh holder having an open interiorextending between a first base of the frusto-conical shape and anopposing second base of the frusto-conical shape, the mesh holderfurther including an annular well defined in the first end which isstructured to receive a wire mesh filter component, the mesh holderfurther including at least one oil passage that extends from the annularwell to the open interior; and a stand-pipe extending from the openinterior and away from the first end.
 19. The apparatus of claim 18,wherein the stand-pipe is inserted as a separate component into the openinterior of the mesh holder, wherein the mesh holder is coupled to thecombo-block base via an o-ring compression fitting, and wherein anannular space is formed between an outside of the stand-pipe and aninterior wall of the mesh holder that defines the open interior, theannular space in communication with the at least one oil passage. 20.The apparatus of claim 18, wherein the mesh holder further includes anouter wall defining the annular well, the outer wall extending away fromthe first end to form a dam structured to discourage oil from flowingradially outward away from the mesh holder, and wherein the oil filterassembly further includes a removable housing having an interior surfacestructured to abut a replaceable oil filter element seated against themesh holder.